The talk at Upper East Side restaurant Sette Mezzo earlier this week was more about “the hardware” than the tableware. Diners on Tuesday night included Caroline Kennedy and husband Ed Schlossberg, with daughter Rose, while at a different table were Stanley and Sydney Shuman, and at another, HBO co-president Richard Plepler dining with former US Sen. Chris Dodd. Leeds Equity founder Jeffrey Leeds — newly married this month (at a ceremony officiated by Rudy Giuliani) to Elizabeth Marshall — was with Perri Peltz and Eric Ruttenberg, but also mingling with other diners and showing off his gleaming new “hardware,” his wedding ring, to all in the room.